iDP3420/3421/3423 User’sMa nual
37 CITIZEN
10.3.6 Electrical Characteristics(1) RS-232Ccircuit
Input (RXD, DSR, mRXD)
[Printer Side] [Host Side]
Output(DTR, TXD, mTXD,RCH, RTS, FAULT)
Equivalentto MAX232
Mark=(-8V):At Busy Mark=(-8V):1
Space=(+8V):At Ready Space=(+8V):0
(2) Others
•RESET : A signal to reset the entire printer.
•PE : A signal to show thatthe paper has run out. Normalat the "LOW" level, but turned
to the "HIGH" le vel when the paper ha s run out.
•GND : Signal gr ound
•FG : Frame ground
E
q
uivalent MAX232
RXD Mark=(-8V): Stop bit
Space=(+8V):Start bit
DTR TXD